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Solenoid-driven chemical feeders able to take an input from a dry contact water meter in order to proportionally inject chemicals. Pulsatron Series C feeders are the most inexpensive pumps that can be controlled by a dry contact water meter and has only a 10:1 manual turndown capability. Series A Plus, C Plus, and E Plus Pulsatron pumps can also accept a dry contact water meter input with manual turndown ratios of 100:1. Pulsatron Series MP feeders can also be controlled with a dry contact water meter and have a precise 1000:1 turndown ratio.